Thought some might find this of interest. It is from Jim Conrad's naturalist's Newsletter. He's living in Mexico at the moment:

"DESCENDING SPIRITS MAKING RAIN

On Tuesday, November 1st, at breakfast at Hacienda
Chichen, just to have something to say, I remarked to
my Maya friend Edgar that yet another shower had
begun, so apparently things were destined to stay lush
and muddy awhile longer.

"He replied, "Espíritus bajando -- spirits coming down.
It always rains like this at this time." Then he moved
away to serve a visitor. When José the shaman came to
eat with me I asked about Edgar's cryptic remark.

""It's the Día de los Difuntos, the Day of the Dead,"
he explained. "On this day spirits descend to the
Earth to gather up souls, to lead them upwards.
Spirits are pure energy so when they gather in the sky
before coming here they concentrate their energies,
that changes the atmospherics, so it rains... "

"Notice that spirits are different from souls. Spirits
are pure energy, but souls can be accompanied by
visible features from their previous lives. And there
are different degrees of spirits, the higher degrees
possessing more energy. Under certain circumstances
souls can be seen. Not all souls wandering on Earth
after the deaths of their bodies return with the
spirits. Some souls might wander for hundreds of
years, or longer. Later Edgar told me that it'll rain
again at the end of the month when the spirits come
together again to lead the souls upward.

""It's all a bit complex," José admitted, seeing me
trying to piece it all together.

"In the afternoon José presided over the construction
of an altar where offerings were left for wandering
souls. It was still raining, as the spirits descended."